chore: remove protobuf source java file

[zyxxoo]

No description provided.

[codecov]

Codecov Report

Merging #2045 (55bd88e) into master (510b12e) will increase coverage by 5.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2045      +/-   ##
============================================
+ Coverage     62.92%   67.99%   +5.07%     
- Complexity      325      978     +653     
============================================
  Files           482      481       -1     
  Lines         41458    39749    -1709     
  Branches       5889     5582     -307     
============================================
+ Hits          26087    27028     +941     
+ Misses        12736    10096    -2640     
+ Partials       2635     2625      -10     

Impacted Files	Coverage Δ
.../apache/hugegraph/backend/store/raft/RaftNode.java	58.33% <0.00%> (-5.13%)	⬇️
...a/org/apache/hugegraph/util/collection/IntSet.java	73.72% <0.00%> (-2.12%)	⬇️
...g/apache/hugegraph/backend/store/BackendTable.java	85.11% <0.00%> (+0.59%)	⬆️
...ugegraph/backend/serializer/TableBackendEntry.java	88.88% <0.00%> (+1.01%)	⬆️
...n/java/org/apache/hugegraph/schema/IndexLabel.java	77.27% <0.00%> (+1.13%)	⬆️
.../hugegraph/backend/store/BackendEntryIterator.java	61.53% <0.00%> (+1.28%)	⬆️
...a/org/apache/hugegraph/task/ServerInfoManager.java	75.00% <0.00%> (+1.74%)	⬆️
...ache/hugegraph/backend/tx/AbstractTransaction.java	75.43% <0.00%> (+2.92%)	⬆️
.../hugegraph/backend/serializer/TableSerializer.java	87.95% <0.00%> (+3.64%)	⬆️
...he/hugegraph/backend/store/mysql/WhereBuilder.java	95.37% <0.00%> (+18.51%)	⬆️
... and 17 more

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[imbajin]

this commit was override by force-push

consider add it in another PR?